Frogs are amphibians because they live both in water and on land. They differ from reptiles in that they lack scales and generally return to the water in order to breed. They are known to typically lay their eggs in puddles, ponds, or lakes and their larvae (tadpoles) are born with gills which they use to breathe in water. Later on in life they develop lungs so that they can breathe on land. Whereas reptiles give birth to live young or lay eggs on land to baby creatures that already possess lungs from the get go and resemble a miniature version of its adult parents.